payne



(No Model.)

B. N. 8v 1). W. PAYNE.

STEAM BOILER.

Patented May 8, 1883.

n. PETERS. Phnlo-Lithogriphen wnhin nm D. C.

' UNTTED STATES PATENT OFFICE.

BENJAMIN N. PAYNE AND DAVID W. PAYNE, OF GORNING, NEW YORK.' I

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 277,426, dated May 8,1883. Applicationfiled January 29, 1883. (No model.) i

theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

Referring to the drawings hereto annexed and forming a part hereof,Figure 1 is a central vertical longitudinal section, Fig. 2 a

front end elevation, and Figs. 3 and 4 details,

of a boiler constructed in accordance with our invention.

Like letters refer to like parts in all the figures.

A represents the boiler proper-that is, so much thereof as is necessaryto a clear understanding of the present invention. The boiler in thisinstance is an ordinary return tubular boiler; but, as'will clearly beseen, any boiler may be used in connection with or be provided with themeans hereinafter described for rendering the use of straw or otherlight fuel practically safe.

B represents the door, which may be supported pivotally or in any usualmanner upon the boiler-head, whereby it may serve its usual functionswhen ordinary fuel--such as wood or coal-is being used. The door isformed with a central opening, B, which, in this instance, is circular;but, if desired, any other outline in cross-section may be adopted. Theopening B is bounded by an inwardly-projecting continuous flange, whichconstitutes a pipe or chute, B which is cast integral with the door.There are also cast integral with the door B two hinge-lugs, b I),located above the chute, whereby a drop door or valve, B is pivotallysupported in a position to close the chute by gravity when not otherwiseoperated. The chute is tapered off at its inner end, so that its lowerside projectswithin the fire-box to a greater distance than its upperside, and hence the weight of the door serves to maintain it in moreclose contact with the chute than if it opening, or it may be in linetherewith, is supported-in this instance, as shown in Fig. 1, byfriction only-a feed-pipe, G, which in cross-section is a completecylinder and adapted to snugly fit the opening B, so that it mayberetained therein or readily removed therefrom. The mouth of thefeed-pipe'is flared outwardly, as at c, and, if desired, the entire bodyof the pipe may be flared outwardly, in order to form a conical outlineor shape, for a purpose hereinafter set forth. As shown in Fig. 4, thefeed-pipe (J is provided with a bayonet-slot, c, and in the opening B ofthe door B are lugs 0 whereby the pipe is removably secured to the door.If desired, the chute may be permanently attached by any suitable meansor be cast integral with the door.-

In operation straw is forced through the pipe 0 and chute B into thefire-box until a sufficient quantity is' supplied for immediateconsumption, and as the straw which is left projecting from the chuteburns away the door B gradually falls to a .closed position. At thistime the straw within the chute and front or inner end of the pipe U isburning; but by reason of the closing of the door and the cylindricaloutline of the pipe, and by reason of the closely-packed condition(shown at d, Fig. 4) of the straw, resulting from the force exertedthereon in pushing the fuel into the fire box, the ignited straw in thechute and pipe is smothered,as no appreciable supply of external air canenter within the pipe to such a distance. Not only is it apparent thatthis operation takes place, but that an additional advantageis secured,in that the external colder air is prevented from coming in contact withand lowering the temperature of the fire within the fire-box. A conicalfeedtube would tend to increase the compactness of the straw therein,and hence increase its smothering function.

Heretofore a supplementary grateless firebox with a feeding-troughhaving a flat top has been removably attached to the boiler* head, andin no Way connected to the fire-box door, the object being to admit nofuel into the fire-box proper. We do not claim such construction as ofour invention, as the door proper of the fire-box cannot be closedwithout removing said trough and supplementary fire-box, and as byreason of the flat top of the feed trough sharp corners are formed, intowhich the straw could not readily and would not naturally be compactedsufficiently to prevent access of air within the pipe, and hence itssmothering function is practically destroyed. For this reason we showand describe and prefer a cylindrical feed-pipe. Furthermore, said pipebeing connected directly to the door of the fire-box proper, it may beemployed, and does not in the least afi'eet the use of theboiler forburning heavy fuels.

\Ve are aware that a fire-box door has heretofore been provided with aninternally-projecting chute having a valve or door, and do not claimsuch as ofour. invention.

Having described our invention and-its operation, what wo'claim as new,andidesire to secure by Letters Patent, is

The combination with the door B,having a cylindrical openin g, Btherein, and having the chute B and door or valve B of the cylindricalfeed-pipe O, removably seeuredwithin the opening'B, all arrangedsubstantially as '2 5 specified.

In testimony whereof we affix our signatures in presence of tivowitnesses.

BENJAMIN N. PAYNE. DAVID W. PAYNE.

Witnesses:

(3130. S. MORX, O. W. SWEETLAND.

